According to Le Chatelier’s principle, what happens to the equilibrium constant (K) when the concentration of the reactants is doubled?

At a fixed temperature, changing the concentration of reactants can shift the equilibrium position, but it does not change the equilibrium constant K. K changes only when the temperature changes. Therefore, doubling the reactant concentration leaves K the same: choice C, “The value of the equilibrium constant (K) remains the same.”

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